Excitement on my Windowsill—Ansel attacking his reflection, a male Northern Cardinal eating, and a Carolina Wren entering my nest box for the first time!

Ansel flew to my window AGAIN and attacked his reflection. FOR 30 MINUTES. AND HE’S STILL HERE!!!
He won’t stop even through I drew highlighter on the outside of my window to break up his reflection. This time I’m even more sure it’s territorial aggression because another Tufted Titmouse flew up and he didn’t attack it. I’m guessing she’s Ansel’s mate. While I was videoing, a male Northern Cardinal came to eat and a Carolina Wren entered my nest box! This is the first time a bird has entered that nest box.
Ansel still will not leave though. What will make him stop attacking his reflection in my window sill!?

Territorial Aggression?

4/7/2021— This Tufted Titmouse woke me up at 8:00 AM to loud chirping and banging outside my window.
Recently, I put out a nest box on my window sill. In case my presence would deter birds from nesting in it, I applied 1-way window-film. Unfortunately, it blocks sunshine from entering my room and it’s reflective on the outside.
I believe this Titmouse was attacking his reflection, thinking it was a rival bird. (I decided to name him “Ansel,” which means “protecter.”)
I drew highlighter on the window to get him to stop, but he hasn’t come back yet so I’m not sure whether it worked or not.
I do have a bird feeder on my windowsill as well, but, since Tufted Titmouse nesting season is beginning, I figured it was probably more likely he was attacking things to protect his nesting territory or claim a new one.
Will birds attack anywhere on their territory or only near their nest? Does he want my new birdhouse?

Mountain Chickadee that landed an my camera

This Chickadee got 2 inches away from my camera three times and the time is landed of the camera. It saw the reflection.

Cornell Lab of Ornithology

Cornell Lab of Ornithology